铜陵新桥铁矿田地质地球化学特征及成因浅析  

XINQIAO IRON-DEPOSIT FIELD IN TONGLING, ANHUI ——GEOLOGIC AND GEOCHEMICAL CHARACTERISTICS AND GENESIS

作　　者：臧文拴[1] 吴淦国[1] 张达[1] 刘爱华[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083

出　　处：《大地构造与成矿学》2004年第2期187-193,共7页Geotectonica et Metallogenia

基　　金：国家重点基础研究发展规划项目 (G19990 43 2 0 6)资助

摘　　要：长期以来有关新桥 (S Fe Cu)矿田的成因一直争论不休 ,如沉积 -改造型、层控 -矽卡岩型、海底喷流沉积型等。作者在综合分析该矿田的地质 -地球化学特征的基础上 ,认为新桥矿田具有二期成矿作用的特点。早期沉积成矿作用形成菱铁矿矿体和不具有工业意义的黄铁矿层。后期岩浆成矿作用形成层状、似层状块状硫化物型、热接触交代矽卡岩型和热液脉型等不同类型的硫化物矿体。The genesis of Xinqiao iron deposit has been debated over the past 20 years. Several hypotheses, i.e. sedimentary-modified deposit, strata-bound skarn deposit, submarine exhalative-sedimentary deposit, have been postulated to account for the mineralization of the iron deposit. A model of the two-stage mineralization was put forward in this paper on the basis of the geologic and geochemical data of the Xinqiao iron deposit. The early mineralization is related to sedimentation, which resulted in the formation of the siderite ore-body and some pyrite ore-bodies. The later mineralization is associated with the Mesozoic magmatism and resulted in the formation of the stratiform and stratoid sulphides, the skarn-type orebodies and vein-type orebodies. These orebodies formed at the different mineralization stages have distinct geologic and geochemical characteristics.

关 键 词：新桥矿田 地质-地球化学特征 成矿作用 

分 类 号：P59[天文地球—地球化学] P61[天文地球—地质学]